Submarine pouring structure of sliding block of injection mold

Abstract

A sliding block latent type pouring structure of an injection mold comprises a mold cavity compound plate and a mold core compound plate, a hot runner base plate and a mold cavity plate are arranged below the mold cavity compound plate, a mold foot, a lower ejector plate, an upper ejector plate and a mold core plate are arranged on the mold core compound plate, an excess material ejector pin and a product ejector pin are connected to the upper ejector plate, and a mold cavity is formed between the mold core plate and the mold cavity plate. A splitter plate is arranged in the hot runner base plate, a hot nozzle is connected below the splitter plate, a sliding block is arranged on the core plate, a hidden runner sprue is arranged on the upper surface of the sliding block, the hot nozzle penetrates through the cavity plate to be communicated with the hidden runner sprue, the hidden runner sprue is communicated with the mold cavity, a receding groove is formed in the core plate located below the sliding block, and an elastic needle insert is arranged on the bottom face of the sliding block. A spring and a pouring gate elastic needle are arranged in the elastic needle insert, the pouring gate elastic needle is matched with the hidden runner pouring gate, an ejector pin insert is arranged on the bottom surface of the core plate, ejection receding holes are formed in the ejector pin insert and the corresponding core plate, the excess material ejector pin is matched with the ejection receding holes, and the sliding block is driven by an outer sliding structure to slide outwards.

Description

Technical Field

[0001] The utility model relates to a latent pouring structure of a slider of an injection mold, belonging to the field of injection molds. Background Art

[0002] When using injection molds to produce plastic products, based on product structure and appearance analysis, if the product surface is required to be smooth and traceless, the gate is usually cast in a latent manner. However, the original latent casting method is as follows: the hot nozzle passes through the slider and the casting is carried out at the bottom of the slider. The runner and gate are all on the bottom surface of the slider. The slider must exit the runner and gate range to be ejected from the mold, resulting in a large slider stroke and the need for cylinder assistance. Moreover, if the injection pressure is too high, the gate will produce flash, which is prone to the risk of mold expansion and seizure. Summary of the Invention

[0003] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide an injection mold slider latent pouring structure in which a latent gate is used for pouring on the surface of the slider. No need to consider the sliding distance of the gate. The slider only needs to slide out the undercut required by the product itself. During the sliding process, the latent gate (material handle) is pulled off.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An injection mold slider latent pouring structure includes a cavity duplexer and a core duplexer, a hot runner pad is provided under the cavity duplexer, a cavity plate is provided under the hot runner pad, a mold foot is provided on the core duplexer, a lower ejector plate and an upper ejector plate are provided between the mold feet, a residual ejector and a product ejector are connected on the upper ejector plate, a core plate is provided on the mold foot, a mold cavity is formed between the core plate and the cavity plate, a diverter plate is provided in the hot runner pad, a hot nozzle is connected under the diverter plate, a slider is provided on the core plate, and the upper surface of the slider A latent runner gate is provided, the hot nozzle passes through the cavity plate and is connected with the latent runner gate, the latent runner gate is connected with the mold cavity, an air avoidance groove is provided in the core plate below the slider, a spring pin insert is provided on the bottom surface of the slider, a spring and a gate spring pin are provided in the spring pin insert, the gate spring pin cooperates with the latent runner gate, an ejector pin insert is provided on the bottom surface of the core plate, an ejection air avoidance hole is provided in the ejector pin insert and the corresponding core plate, the excess material ejector cooperates with the ejection air avoidance hole, and the slider is driven to slide outward by the outward sliding structure.

[0006] Furthermore, the outer sliding structure includes an inclined guide hole provided in the slider, an inclined guide column connected to the lower side of the cavity plate, and the inclined guide column cooperates with the inclined guide hole.

[0007] The beneficial effects of the utility model are:

[0008] The slider surface is cast in a latent runner gate manner, and there is no need to consider the sliding distance of the residual material (or material handle) in the gate. The slider can directly break the residual material during the outward sliding process. The required breaking stroke is short (according to the test mold data, only 3mm is needed to break the residual material). The action is crisp and clear, the demoulding is smooth, and the occurrence of flash and seizure can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the latent pouring structure of the injection mold slider of the utility model;

[0010] Figure 2 This is a schematic diagram of the mold closing and injection molding state of the utility model;

[0011] Figure 3 This is a schematic diagram of the mold opening and demoulding state of the utility model;

[0012] Figure 4 It is a schematic diagram of the outer sliding structure of the utility model. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0014] Example 1, as Figure 1 — Figure 4 As shown, a latent pouring structure of the slider of the injection mold comprises a cavity double plate 1 and a core double plate 2, a hot runner pad 3 is arranged under the cavity double plate, a cavity plate 5 is arranged under the hot runner pad, a mold foot 6 is arranged on the core double plate, a lower ejector plate 7 and an upper ejector plate 8 are arranged between the mold feet, a residual ejector 4 and a product ejector 41 are connected to the upper ejector plate 8, a core plate 9 is arranged on the mold foot, a mold cavity 10 is formed between the core plate 9 and the cavity plate 5, a diverter plate 11 is arranged in the hot runner pad 3, a hot nozzle 12 is connected under the diverter plate, an upper slider 15 is arranged on the core plate 9, and a latent runner pouring The hot nozzle 12 passes through the cavity plate 5 and is connected with the latent runner gate 16. The latent runner gate 16 is connected with the mold cavity 10. An air avoidance groove 17 is provided in the core plate 9 below the slider 15. A spring insert 18 is provided on the bottom surface of the slider 15. A spring 19 and a gate spring pin 20 are provided in the spring insert. The gate spring pin 20 cooperates with the latent runner gate 16. An ejector pin insert 21 is provided on the bottom surface of the core plate 9. An ejection air avoidance hole 22 is provided in the ejector pin insert 21 and the corresponding core plate 9. The excess material ejector 4 cooperates with the ejection air avoidance hole 22. The slider 15 is driven to slide outward by the outward sliding structure.

[0015] During injection molding, the molten plastic raw material enters from the hot nozzle 12, passes through the latent runner gate 16, and is injected into the mold cavity 10, and forms a product 14 in the mold cavity. The residual material 13 is formed in the latent runner gate 16, and the gate elastic needle 20 is against the bottom of the residual material 13, and the gate elastic needle 20 is staggered with the ejection avoidance hole 22. The product ejector pin 41 is against the bottom surface of the product 14. When the product 14 is completely injection molded, the mold is opened, and the power of the injection molding machine drives the cavity plate 5 to separate from the core plate 9. The slider 15 moves with the core plate 9, but under the action of the outward sliding structure, it drives the slider 15 and the elastic needle insert 18 (the elastic needle insert is located in the avoidance groove 17) to slide outward at the same time, and the residual material 13 is removed from the mold. The product 14 is pulled off, and after the slider slides out, the bottom of the gate spring pin 20 is aligned with the ejection avoidance hole 22. At this time, the power (the ejection cylinder 27 in this embodiment) drives the lower ejector plate 7 and the upper ejector plate 8. The upper ejector plate 8 drives the residual material ejector 4 to pass through the ejection avoidance hole 22 and press against the bottom of the gate spring pin 20, driving the gate spring pin 20 to eject the residual material 13 out of the underground runner gate 16. At the same time, the product ejector 41 ejects the product 14 out of the mold, and the demoulding is completed. The mold is closed, and the slider 15 is driven by the outer sliding structure to reset. The gate spring pin 20 is staggered with the ejection avoidance hole 22. The gate spring pin 20 automatically falls and resets under the action of the spring 19, and the mold starts injection molding again.

[0016] This solution uses a latent runner gate on the upper surface of the slider for casting. There is no need to consider the sliding distance of the residual material (or material handle) in the gate. The slider can directly break the residual material during the outward sliding process. The required breaking stroke is short (according to the test mold data, only 3mm is needed to break the residual material). The action is crisp and clear, the demoulding is smooth, and the occurrence of flash and seizure can be avoided.

[0017] Furthermore, the outward sliding structure includes an inclined guide hole 25 provided in the slider 15, and an inclined guide column 26 is connected to the lower part of the cavity plate 5. The inclined guide column 26 cooperates with the inclined guide hole 25. When the mold is opened, the cavity plate does not move, and the slider moves with the core plate. With the cooperation of the inclined guide column and the inclined guide hole, the slider is driven to slide outward. There is no need to provide an additional external sliding cylinder, which saves costs and can also reduce the overall volume of the mold, making the mold suitable for processing by small and medium-sized injection molding machines.

[0018] The above-mentioned specific implementation methods are used to illustrate the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Within the spirit of the present invention and the scope of protection of the claims, any modifications, equivalent replacements, improvements, etc. made to the present invention shall fall within the scope of protection of the present invention.

Claims

1. A latent pouring structure of an injection mold slider, comprising a cavity duplex plate (1) and a core duplex plate (2), a hot runner pad (3) being provided under the cavity duplex plate, a cavity plate (5) being provided under the hot runner pad, a mold foot (6) being provided on the core duplex plate, a lower ejector plate (7) and an upper ejector plate (8) being provided between the mold feet, a residual ejector pin (4) and a product ejector pin (41) being connected to the upper ejector plate (8), a core plate (9) being provided on the mold foot, a mold cavity (10) being formed between the core plate (9) and the cavity plate (5), a diverter plate (11) being provided in the hot runner pad (3), a hot nozzle (12) being connected to the diverter plate, and characterized in that: A slider (15) is provided on the core plate (9), a latent runner gate (16) is provided on the upper surface of the slider, the hot nozzle (12) passes through the cavity plate (5) and is communicated with the latent runner gate (16), the latent runner gate (16) is communicated with the mold cavity (10), an air avoidance groove (17) is provided in the core plate (9) below the slider (15), a spring pin insert (18) is provided on the bottom surface of the slider (15), a spring (19) and a gate spring pin (20) are provided in the spring pin insert, the gate spring pin (20) cooperates with the latent runner gate (16), an ejector pin insert (21) is provided on the bottom surface of the core plate (9), an ejection air avoidance hole (22) is provided in the ejector pin insert (21) and the corresponding core plate (9), the excess ejector pin (4) cooperates with the ejection air avoidance hole (22), and the slider (15) is driven to slide outward by the outward sliding structure.

2. The injection mold slider latent pouring structure according to claim 1, characterized in that The outer sliding structure includes an inclined guide hole (25) provided in the slider (15), an inclined guide column (26) connected to the lower side of the cavity plate (5), and the inclined guide column (26) cooperates with the inclined guide hole (25).

Images